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TECOGEN INC.

TGEN Net buying
CIK 0001537435 #4338 in the set updated 20 Sep 2026
Bought (120 mo)
$1.31M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$345.80K
$0.00 on a plan · $345.80K straight out of an exercise
Sold at will
$0.00
0 of 4 sales
Net
+$964.64K
+$1.31M against sales at will

By person

11 insiders · 155 transactions
0.6×

Abinand Rangesh holds only 0.6 times base salary in stock. $136.83K of shares against $210.00K in salary for 2025.

Salary from the company's own proxy. The shares are what Abinand Rangesh last reported holding, valued at $0.79, the price Common Stock was last bought or sold at on the open market here, on 24 Apr 2026.

Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
Hatsopoulos John
Director
$672.72K (86)
—
+$672.72K
1,038,951
3.44%
$816.62K
+520.2%
Lafaille Stephen
VP of Business Development
$1.00K (1)
$345.80K (4) scheduled
−$344.80K
29,013
0.0961%
$22.80K
—
Lewis Earl
Director
$298.47K (32)
—
+$298.47K
1,646,006
5.45%
$1.29M
+102.2%
MAXWELL CHARLEST
Director
$215.15K (10)
—
+$215.15K
224,590
0.7440%
$176.53K
+327.8%
Hirsch Susan B
Director
$48.63K (3)
—
+$48.63K
265,416
0.8792%
$208.62K
+8.1%
Whiting John Kimball IV
General Counsel & Secretary
$23.80K (1)
—
+$23.80K
19,342
0.0641%
$15.20K
—
Deschenes Roger P.
CAO
$22.30K (1)
—
+$22.30K
29,013
0.0961%
$22.80K
—
Rangesh Abinand
Chief Executive Officer
$11.05K (7)
—
+$11.05K
174,081
0.5767%
$136.83K
—
Ghoniem Ahmed
Director
$10.00K (1)
—
+$10.00K
12,723
0.0421%
$10.00K
—
Benjamin Locke M.
CEO
$7.32K (2)
—
+$7.32K
8,836
0.0293%
$6.95K
+158.5%
Panora Robert
COO and President
—
—
—
9,671
0.0320%
$7.60K
—

Individual transactions

144
Insider
Date
Role
Action
Shares
Price
Amount
Ghoniem Ahmed
24 Apr 2026
Director
Buy
12,723
$0.79
$10.00K
Hirsch Susan B
13 Apr 2026
Director
Buy
5,000
$3.73
$18.65K
Lewis Earl
27 Mar 2026
Director
Buy
5,000
$2.52
$12.60K
Hirsch Susan B
27 Mar 2026
Director
Buy
10,000
$2.54
$25.40K
Lewis Earl
26 Mar 2026
Director
Buy
5,000
$2.88
$14.41K
Whiting John Kimball IV
23 Mar 2026
General Counsel & Secretary
Buy
10,000
$2.38
$23.80K
Rangesh Abinand
20 Mar 2026
Chief Executive Officer
Buy
3,000
$2.30
$6.89K
Deschenes Roger P.
20 Mar 2026
CAO
Buy
10,000
$2.23
$22.30K
Lafaille Stephen
3 Mar 2025
VP of Business Development
Buy
400
$2.50
$1.00K
Lewis Earl
22 Nov 2024
Director
Buy
100,000
$0.71
$71.00K
Hatsopoulos John
27 Sep 2024
Director
Buy
10,000
$0.84
$8.38K
Hatsopoulos John
25 Sep 2024
Director
Buy
10,000
$0.86
$8.60K
Hatsopoulos John
19 Aug 2024
Director
Buy
10,000
$0.90
$8.95K
Lewis Earl
15 Jul 2024
Director
Buy
10,000
$0.68
$6.80K
Lewis Earl
15 Jul 2024
Director
Buy indirect
10,000
$0.68
$6.80K
Hatsopoulos John
10 Jul 2024
Director
Buy
22,466
$0.65
$14.60K
Hatsopoulos John
29 May 2024
Director
Buy
10,000
$0.80
$8.00K
Hatsopoulos John
28 May 2024
Director
Buy
1,265
$0.80
$1.01K
Hatsopoulos John
24 May 2024
Director
Buy
8,735
$0.80
$6.99K
Hatsopoulos John
22 May 2024
Director
Buy
3,200
$0.79
$2.53K
Hatsopoulos John
21 May 2024
Director
Buy
13,800
$0.79
$10.90K
Hatsopoulos John
16 May 2024
Director
Buy
3,000
$0.75
$2.25K
Hatsopoulos John
15 May 2024
Director
Buy
10,000
$0.74
$7.40K
Lewis Earl
1 May 2024
Director
Buy
5,000
$0.75
$3.75K
Hatsopoulos John
24 Apr 2024
Director
Buy
5,000
$0.67
$3.35K
Lewis Earl
24 Apr 2024
Director
Buy
10,000
$0.68
$6.80K
Hatsopoulos John
23 Apr 2024
Director
Buy
1,000
$0.68
$677.50
Hatsopoulos John
23 Apr 2024
Director
Buy
5,000
$0.69
$3.43K
Hatsopoulos John
16 Apr 2024
Director
Buy
1,000
$0.68
$679.00
Hatsopoulos John
15 Apr 2024
Director
Buy
1,000
$0.70
$700.00
Hatsopoulos John
12 Apr 2024
Director
Buy
1,000
$0.70
$699.70
Hatsopoulos John
11 Apr 2024
Director
Buy
1,000
$0.70
$700.00
Hatsopoulos John
9 Apr 2024
Director
Buy
1,000
$0.70
$700.00
Hatsopoulos John
8 Apr 2024
Director
Buy
1,000
$0.70
$700.00
Hatsopoulos John
1 Apr 2024
Director
Buy
5,000
$0.70
$3.50K
Hatsopoulos John
1 Apr 2024
Director
Buy
612
$0.70
$428.40
Hatsopoulos John
28 Mar 2024
Director
Buy
2,388
$0.70
$1.67K
Hatsopoulos John
27 Mar 2024
Director
Buy
2,000
$0.70
$1.40K
Lewis Earl
24 Jan 2024
Director
Buy
9,152
$0.78
$7.14K
Lewis Earl
23 Jan 2024
Director
Buy
10,000
$0.68
$6.80K
Hatsopoulos John
22 Jan 2024
Director
Buy
10,000
$0.77
$7.70K
Hatsopoulos John
18 Jan 2024
Director
Buy
10,000
$0.73
$7.35K
Hatsopoulos John
16 Jan 2024
Director
Buy
100,000
$0.73
$73.46K
Hatsopoulos John
27 Dec 2023
Director
Buy
25,000
$0.80
$20.00K
Hatsopoulos John
22 Dec 2023
Director
Buy
25,000
$0.80
$20.00K
Hatsopoulos John
14 Dec 2023
Director
Buy
44,000
$0.90
$39.60K
Hatsopoulos John
14 Dec 2023
Director
Buy
5,000
$0.85
$4.25K
Hatsopoulos John
14 Dec 2023
Director
Buy
1,000
$0.83
$825.00
Hatsopoulos John
20 Nov 2023
Director
Buy
4,000
$0.85
$3.38K
Hatsopoulos John
17 Nov 2023
Director
Buy
46,000
$0.85
$38.87K
Hatsopoulos John
14 Nov 2023
Director
Buy
100
$0.85
$84.50
Hirsch Susan B
19 Oct 2023
Director
Buy
5,000
$0.92
$4.58K
Lewis Earl
18 Oct 2023
Director
Buy
25,000
$0.91
$22.75K
Hatsopoulos John
17 Oct 2023
Director
Buy
50,000
$0.80
$40.00K
Hatsopoulos John
12 Oct 2023
Director
Buy
50,000
$0.80
$40.00K
Lewis Earl
9 Oct 2023
Director
Buy
2,000
$0.80
$1.60K
Lewis Earl
9 Oct 2023
Director
Buy
2,000
$0.80
$1.60K
Hatsopoulos John
29 Sep 2023
Director
Buy
2,000
$0.98
$1.96K
Hatsopoulos John
27 Sep 2023
Director
Buy
1,380
$0.91
$1.26K
Hatsopoulos John
26 Sep 2023
Director
Buy
2,000
$0.92
$1.84K
Hatsopoulos John
19 Sep 2023
Director
Buy
5,000
$0.91
$4.55K
Lewis Earl
8 Sep 2023
Director
Buy
10,000
$0.95
$9.50K
Hatsopoulos John
7 Sep 2023
Director
Buy
200
$1.00
$200.00
Hatsopoulos John
5 Sep 2023
Director
Buy
10,000
$0.97
$9.70K
Lewis Earl
5 Sep 2023
Director
Buy
10,000
$1.00
$10.00K
Rangesh Abinand
30 Aug 2023
Chief Executive Officer
Buy
800
$1.02
$816.00
Rangesh Abinand
23 Aug 2023
Chief Executive Officer
Buy
200
$1.02
$204.00
Hatsopoulos John
22 Aug 2023
Director
Buy
5,000
$1.12
$5.60K
Hatsopoulos John
17 Aug 2023
Director
Buy
4,674
$1.04
$4.86K
Hatsopoulos John
15 Aug 2023
Director
Buy
5,000
$1.00
$5.00K
Rangesh Abinand
15 Aug 2023
Chief Executive Officer
Buy
1
$0.95
$0.95
Lewis Earl
14 Aug 2023
Director
Buy
1,500
$1.00
$1.50K
Hatsopoulos John
26 Jun 2023
Director
Buy
1,000
$0.96
$960.00
Rangesh Abinand
20 Jun 2023
Chief Executive Officer
Buy
1,500
$1.04
$1.56K
Hatsopoulos John
20 Jun 2023
Director
Buy
3,000
$1.00
$3.00K
Hatsopoulos John
15 Jun 2023
Director
Buy
5,000
$1.11
$5.55K
Hatsopoulos John
12 Jun 2023
Director
Buy
5,000
$1.12
$5.60K
Hatsopoulos John
8 Jun 2023
Director
Buy
500
$1.09
$546.25
Hatsopoulos John
7 Jun 2023
Director
Buy
3,000
$1.00
$3.00K
Hatsopoulos John
7 Jun 2023
Director
Buy
7,000
$1.00
$6.99K
Hatsopoulos John
6 Jun 2023
Director
Buy
1,000
$1.14
$1.14K
Hatsopoulos John
6 Jun 2023
Director
Buy
7,000
$1.00
$7.00K
Hatsopoulos John
2 Jun 2023
Director
Buy
1,000
$1.09
$1.09K
Hatsopoulos John
26 May 2023
Director
Buy
1,000
$1.17
$1.17K
Hatsopoulos John
25 May 2023
Director
Buy
1,000
$1.17
$1.17K
Hatsopoulos John
23 May 2023
Director
Buy
1,000
$1.17
$1.17K
Lewis Earl
15 May 2023
Director
Buy
10,000
$0.96
$9.60K
Hatsopoulos John
15 May 2023
Director
Buy
3,649
$1.00
$3.65K
Lewis Earl
29 Mar 2023
Director
Buy
10,000
$1.18
$11.80K
Lewis Earl
29 Mar 2023
Director
Buy
10,000
$1.17
$11.70K
Hatsopoulos John
28 Mar 2023
Director
Buy
17,700
$1.00
$17.70K
Lewis Earl
28 Mar 2023
Director
Buy
3,200
$1.02
$3.26K
Lewis Earl
28 Mar 2023
Director
Buy
700
$1.02
$710.50
Lewis Earl
28 Mar 2023
Director
Buy
2,100
$1.03
$2.16K
Hatsopoulos John
27 Mar 2023
Director
Buy
11,419
$1.00
$11.39K
Lewis Earl
27 Mar 2023
Director
Buy
806
$0.98
$793.51
Hatsopoulos John
24 Mar 2023
Director
Buy
50,000
$0.92
$46.00K
Lewis Earl
24 Mar 2023
Director
Buy
2,694
$0.93
$2.51K
Lewis Earl
24 Mar 2023
Director
Buy
5,500
$0.92
$5.06K
Lewis Earl
22 Mar 2023
Director
Buy
5,000
$0.87
$4.35K
Hatsopoulos John
21 Mar 2023
Director
Buy
10,000
$0.88
$8.80K
Hatsopoulos John
20 Mar 2023
Director
Buy
10,000
$0.84
$8.40K
Lewis Earl
20 Mar 2023
Director
Buy
5,000
$0.87
$4.35K
Lewis Earl
20 Mar 2023
Director
Buy
10,000
$0.90
$9.00K
Rangesh Abinand
20 Mar 2023
Chief Executive Officer
Buy
1,000
$0.90
$899.50
Rangesh Abinand
20 Mar 2023
Chief Executive Officer
Buy
800
$0.85
$676.16
Hatsopoulos John
19 Oct 2022
Director
Buy
5,000
$1.00
$5.00K
Hatsopoulos John
17 Oct 2022
Director
Buy
5,000
$0.98
$4.90K
Hatsopoulos John
11 Oct 2022
Director
Buy
5,000
$0.96
$4.80K
Hatsopoulos John
10 Oct 2022
Director
Buy
5,000
$0.96
$4.80K
Lewis Earl
29 Sep 2022
Director
Buy
5,000
$0.97
$4.85K
Lewis Earl
28 Sep 2022
Director
Buy
8,183
$0.95
$7.77K
Hatsopoulos John
8 Sep 2022
Director
Buy
5,000
$1.17
$5.83K
Hatsopoulos John
2 Sep 2022
Director
Buy
5,000
$1.10
$5.50K
Hatsopoulos John
1 Sep 2022
Director
Buy
5,000
$1.10
$5.50K
Hatsopoulos John
31 Aug 2022
Director
Buy
5,000
$1.10
$5.50K
Hatsopoulos John
30 Aug 2022
Director
Buy
5,000
$1.14
$5.70K
Hatsopoulos John
29 Aug 2022
Director
Buy
5,000
$1.23
$6.17K
Hatsopoulos John
26 Aug 2022
Director
Buy
5,000
$1.24
$6.19K
Hatsopoulos John
25 Aug 2022
Director
Buy
5,000
$1.25
$6.25K
Hatsopoulos John
24 Aug 2022
Director
Buy
2,300
$1.24
$2.85K
Hatsopoulos John
24 Aug 2022
Director
Buy
2,700
$1.23
$3.31K
Hatsopoulos John
23 Aug 2022
Director
Buy
5,000
$1.25
$6.25K
Hatsopoulos John
22 Aug 2022
Director
Buy
5,000
$1.21
$6.05K
Lewis Earl
17 Aug 2021
Director
Buy
5,000
$1.94
$9.70K
Lewis Earl
17 Aug 2021
Director
Buy
10,000
$1.82
$18.20K
Lewis Earl
8 Jun 2020
Director
Buy
11,711
$0.82
$9.60K
Hatsopoulos John
23 Apr 2020
Director
Buy
5,000
$1.02
$5.09K
Hatsopoulos John
23 Apr 2020
Director
Buy
5,000
$1.01
$5.06K
Hatsopoulos John
23 Apr 2020
Director
Buy
5,000
$0.99
$4.97K
Hatsopoulos John
23 Apr 2020
Director
Buy
5,000
$0.99
$4.97K
Hatsopoulos John
23 Apr 2020
Director
Buy
5,000
$1.00
$5.00K
Benjamin Locke M.
21 Apr 2020
CEO
Buy indirect
2,000
$1.02
$2.04K
Benjamin Locke M.
14 Nov 2017
Co-CEO
Buy
2,000
$2.64
$5.28K
MAXWELL CHARLEST
6 Jan 2017
Director
Buy
25,000
$4.00
$100.00K
MAXWELL CHARLEST
4 Jan 2017
Director
Buy
1,000
$3.84
$3.84K
MAXWELL CHARLEST
4 Jan 2017
Director
Buy
11,000
$3.85
$42.35K
MAXWELL CHARLEST
30 Dec 2016
Director
Buy
700
$4.00
$2.80K
MAXWELL CHARLEST
30 Dec 2016
Director
Buy
200
$3.95
$790.00
MAXWELL CHARLEST
29 Dec 2016
Director
Buy
1,200
$3.84
$4.61K
MAXWELL CHARLEST
29 Dec 2016
Director
Buy
9,800
$3.85
$37.73K
MAXWELL CHARLEST
29 Dec 2016
Director
Buy
4,200
$3.95
$16.59K
MAXWELL CHARLEST
28 Dec 2016
Director
Buy
69
$3.92
$270.48
MAXWELL CHARLEST
23 Dec 2016
Director
Buy
1,600
$3.86
$6.18K
Show all 155 transactions →

What was left out

Form 4 filings counted 160
Amendments (4/A) skipped 14
Filings about a different issuer 0
Unreadable filings 0
Joint filings 0
Sales on a Rule 10b5-1 plan 0
Sales straight out of an exercise 4
Sales at will 0
Transactions with no price 0
Shares from compensation/vesting 1,240,593
History held since 14 Dec 2016